Laboratory studies of potassium-halide-induced high-temperature corrosion of superheater steels. Part 1: Exposures in dry air

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Hao Wu, Patrik Yrjas, Mikko Hupa
Publication year: 2015
Journal: Energy and Fuels
Journal acronym: Energy Fuels
Volume number: 29
Issue number: 2
Start page: 1186
End page: 1195
eISSN: 1520-5029


Abstract

In recent years, some concerns about halogen (Cl, Br, and F)-related high-temp. corrosion in biomass- or waste-fired boilers have been raised. The presence of alkali chlorides in the deposits is believed to play a major role in high-temp. corrosion of the superheater steel materials in biomass- or waste-fired boilers. Available data are very scarce regarding alkali-bromide- or -fluoride-induced corrosion. This work has carried out using lab-scale high-temp. corrosion tests with three different superheater tube materials (10CrMo9-10, AISI 347, and Sanicro 28) exposed to KBr or KF at different temps. (400-600 °C). At relatively low temps. (≤550 °C), KBr and KF showed corrosivity similar to that of KCl. At 600 °C, KF showed much stronger corrosivity than either KBr or KCl, esp. in the cases with the low-alloy steel 10CrMo9-10 and the austenitic steel AISI 347. At 550 °C and above, the oxide layers formed on the three steels were generally thicker and more uneven when exposed to KF compared to the results of the tests with KBr.

Last updated on 2019-18-06 at 07:02